Yes, look through the scope with the objective bell (front) flush against the mirror. You will see two reticles in your field of view. Turn the W/E adjustment knobs until both reticles are aligned or become one. Your reticle is now centered in your scope tubes adjustment range.
The more combersome way is to count clicks from one stop to the other stop and then adjust the W/E dials to the half way point. The mirror trick is faster and easier if the scope has not already been mounted on the rifle.
In theory, the closer you can keep the reticle to optical center of the scope, the less stress you put on the interal springs and moving parts. And you have the full range of travel if you want to dail in changes in elevation or windage.
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